Preview YouTube Video

At the time of writing this text, the HTML editor does not allow to play YouTube video by default, but you can insert it into the editor and edit properties like width, height and CSS style.

The editor does not play YouTube videos because at the time of writing this text YouTube does not support versions of Internet Explorer older than 9 and the editor works in Internet Explorer 7 emulation mode by default. If you want to enable playing YouTube videos in Preview mode, then you should change the default emulated IE mode using a special Windows Registry key. This article explains how you can do that: KnownIssues/Modern Html, CSS and Javascript features.